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9.3 Material cycles and decomposition

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Question 24
H

Peat contains carbon from partially decomposed plants. A peatland is drained, increasing oxygen availability without changing its temperature.

Which linked change is most likely?

[1]
A

Aerobic decomposition decreases, so carbon storage decreases and carbon dioxide release increases.

B

Aerobic decomposition decreases, so carbon storage increases and carbon dioxide release decreases.

C

Aerobic decomposition increases, so carbon storage increases and carbon dioxide release decreases.

D

Aerobic decomposition increases, so carbon storage decreases and carbon dioxide release increases.

Markscheme

9.3 Material cycles and decomposition Questions

  1. GCSE
  2. /Biology
  3. /9.3 Material cycles and decomposition

44 exam-style questions on Edexcel GCSE Biology 9.3 Material cycles and decomposition, covering 9.3.1 Cycling of materials through ecosystems, 9.3.2 The carbon cycle, 9.3.3 The water cycle, 9.3.4 The nitrogen cycle, 9.3.5 Indicator species and pollution, 9.3.6 Decomposition in preservation and composting, and 9.3.7 Rate changes in decay of biological material. Each one has a worked solution and a mark scheme showing where the marks go.

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